Light (both natural and otherwise) is an essential tool in photography - here's a gallery dedicated to light use in photos, including low-light photography, black and white available light photos, night and morning photos.
Musical Harmony
© Heather K. McFarlandGazing Into Her Eyes
© Michelle CampbellSpin,Spinning,Spun
© Lyndel ReeseLight & Shadow
© Kerry DragerSunset on Sedona (AZ) Red Rocks with Moon
© Light _girl behind glass block
© Tom W. HauberLooking For The Muskrat
© Michelle CampbellSundown at Golden Gate
© Kerry DragerMS-1478
© Jim Zuckerman